diff --git a/examples/context/theme-detailed-app.js b/examples/context/theme-detailed-app.js
index 114e3b6c..77417aba 100644
--- a/examples/context/theme-detailed-app.js
+++ b/examples/context/theme-detailed-app.js
@@ -12,6 +12,7 @@ function Toolbar(props) {
 
 class App extends React.Component {
   constructor(props) {
+    super(props);
     this.state = {
       theme: themes.light,
     };